Claude Fable 5.2 tops Epoch Capabilities Index at 173, speculation mounts on OpenAI's next model
haider1 · x · 2026-11-15
Per the Epoch Capabilities Index (ECI) leaderboard, OpenAI models have generally scored better than other labs, possibly due to math/science strengths. Claude Fable 5.2 gained 6 points over 5.1 with a new pre-train, now topping the chart at 173 (90% CI 170–177), ahead of Gemini 4 Carbon (170) and GPT-6 Astra (169). The author speculates that if OpenAI's rumored Navier–Stokes model follows a similar trend it could gain 9 points over GPT-6 Astra; anything below 175 would be disappointing. Speculative analysis, not official.
Related event: Claude Fable 5.2 tops Epoch Capabilities Index as a clear outlier(3 posts)→
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